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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96565d48ab0c247c249120e2266c86ba35b4f71ee1a706adacfcef154dd4158' 
  AND token = 'zL58n7t4xV8ktUa8hCLge6zM5qBmmbilBLC6wsZz3Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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