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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9550af095b26ac15f6dd203d605c7719aaa3e94ced90b0039d173b572e46841d' 
  AND token = 'bgEG2MnFZINu9PAxP/pxJJw6hcJ6ufRixnNFSSG+iHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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