SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88586051631b787953f1cb2e14d7334b9f3de959157037359c807776c7715b87' 
  AND token = 'r9bvC5T/JKTAAMbhyp+SigStjFwhWuMd/ppA/YZBNEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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