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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa4edfcf3657802b31e5dbd4bd5232243d90f5a32f1e6862f2fb9f8365a2cc1' 
  AND token = 'WEIau1H1yQqbGYJk8CBe7fxVxcmLumAlBhyZkt0jP6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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