SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b049a2d4d46f11d1f4fd280d8753ffa68955ae6916baa5de451c40c83ef034' 
  AND token = 'ZWk3U+WIo1BaqwFQ7nF9/XxJE7plEGaVt0sLBnnlXVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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