SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08716b3020a854b5c1c99be3f6c4f14bc89c63904a9e36223a206a2e97c6c3b9' 
  AND token = 'W4zrqzOXwHm8Vqy/NfhtPxtDWnxY8fwZYIgxbL6pV5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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