Just use google, there are tons of dumped keys available. Don't ask for link as it would be against rules to share them here.
Answering your topic question - if you mean prod.keys - no.
If you mean titlekey - it's in tik file at 0x180 offset. But then you don't need key, you can just use emulator's internal tool to dump files, or on hardware use DBI/nxdumptool.