SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc93daf2af82911040c89b2b2a75a595e4cbbdf0a044a4bfae49a5d2121d6ab6' 
  AND token = 'B+8XJKea33XovI9+pPndIzKpVjhjFGS57Uy2sa6hwYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables