It’s hard to identify right cable to be used, cause it’s not like in cooper standard Cat 5e, 6, etc… with fiber is just single or multi mode… Am I wrong?
MikroTIK SFP can do Single Mode, definitely, but it is still a fibre pair Single Mode.
The cable you have described is for OS2 Single Mode / Single Fibre where it does transmit and receive over the same fibre. MikroTIK SFP modules don’t support this type.
As mentioned, the cost of say a 6 core to a 12 core or so is usually negligible, so it’s best to have spare pairs for breakage or extra bandwidth in future.
According to the specification supplied, that cable will work with the S-35/53LC20D pair of transceivers over one fiber. The spec says the cable is designed for the following wavelengths: 1310nm, 1383nm and 1550nm and is single-mode.
S-35LC20D has T1310nm R1550nm for one end and the S-53LC20D has T1550nm R1310nm. Fiber will have to be terminated with LC connector for this. Edit: Over a single fiber, not a pair.