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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b05eaa6a78b490e0f211e0d44fe674ac25f8d96c0c576bfa4b1877650a51bd17' 
  AND token = 'Vw7PSvxqRf79MlCRsNLW0CivOURkjn2OsmZTrx3e9so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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