Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956799788a85fb45be77298704cd5a2ddf49d312869862dc5edd4eaa9bb6f5cd' 
  AND token = '+zMIobtns43LbKYpBn8acWM6hvgzBHOavrYBTuWgaFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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