SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13890379d94a75eee9209a99798cbd63e66069af0240d947948340bf33f5c9a' 
  AND token = 'awRs9gRmq1iUy7PoNHIara+ikksz264r+b3k0QciK90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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