SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65294ba6354624c213d4e2c321ac48d6f54db5d92a02181e44ec92218b8cefa4' 
  AND token = 'wYm+uInliBLq2HJ/64pWAaNYhdjBDvsgZwR76VvfoZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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