SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11827dfb3b3cf7f52f7556593fa2dca4a87b1a5dff0318da6704d2863f610473' 
  AND token = '110cIBC9O7bYOGtHu+9SZ3VTYKoTqJchlHxbEAqfXls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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