SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '679b2e94dc3dbf20363b5af6bae0332ebbb4f3de4124bdfd98f2a66c35865855' 
  AND token = '9GeXxXS/BNm7n4U/ArH8fXkbU5AEoPpb0esirNmFR5w=' 
  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