SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96d2eb8b2b8177965335b6ce149a12b1b03d43e10f5adf4e4a9dcaeba0600f1' 
  AND token = 'HW8sVhHDhV5hYj//Ulc7qxhOh0nEhuZmJtngn9Fnrws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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