SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9c53d79471d1909d93340618fca3e17b79d6299d27d2665138aaf2c4bc680d' 
  AND token = 'h4OLG1eH5aEWCZ8cH6P6Lc6X5HKDsbzaPuUe+FBjhqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}