SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b80756d4fda3c7ea85a4a4cf7024786b3f6e34c77f095a515ff4f847c69c9c02' 
  AND token = 'Lvlo4BilBnbA6GBK3sVJjIBamyAz/x3m6DUl1ZuT2yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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