SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a68e2834b9db45e8b786dacc548739ed96d1619d29386625087d0c5da74d05' 
  AND token = 'K9sn4hJlIXrj/hDfryk9p9AhGnmLW6Z1NF/BOAjV7Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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