Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ecd6b271598ebec62da53fcb5979bbf6292fd2a3ca507000663ad5a788ba9cd' 
  AND token = 'hgornOrbFvLSbOlpL6aross1+v7keh6GJWzVb8OVBBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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