SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '067902d08b7ff9dd2b6adf860d489404ecc96753f065af4291539787526feedc' 
  AND token = 'PuGgYoh6mfJjYINXMIPvPe3V9H/+puapLd62YNDvrBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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