Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa29ca5eeb8c2075d4c93f023d3ca50513f6d98ce96d022326999dd349744ae' 
  AND token = 'yE5MVGtiS2gM+4huhY9TFS+EGBwsB/iqa5uhaN3a8PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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