I don't think they have one for Nokia right now. I think they were making one a year or so ago, but I looked around and couldn't find anything about it.

If you have a Nokia S60 Symbian series phone you can emulate MK games.There are emulators of Nes,Snes,GameBoy b/w and color you can find at www.vampent.com ,but not all of them work well(Snes i mean)

There is also a Sega16bit emulator called Picodrive but i don't know where to find that one.I haven't tried it but people say it runs at 90% the normal speed even with the sound turned on.
It's better than the Snes emu made by Vampent that has 70-80%percent in just some games and with the sound turned off.