Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2da882874f92220fa33abbcc9cffba9bd986706b1573e8d5f021b1bd493ec2' 
  AND token = 'zNz8swhiuD+ZQn8JrpW3TsW1oZmYDMEpglMa6fZfv1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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