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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658a8353f2662c80ff0ecc2034a11d6c231c1f6d6dd4b639525be0ce185174a2' 
  AND token = '6LnnVrOG/PG3PdI9Q7LwtKFjufhiS0t6YD2HTk7yYHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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