SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff0036e2bb08690b4f9d189c0624c3e6a7595901a472ce874b8665df4cdd7ea' 
  AND token = '6ERxtFdAO7aJxsC1IIMZTVs7qF5+vYBZEMj03wS/8Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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