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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22fd42e0199f9c47d1abf3b62f92d414de18956d9a89e6a3c26a66177bd37db' 
  AND token = 'C7AT1JY5kG7Y0XyOzYJlgl0LjousBD0WDUhkf2lbyjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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