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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9703925b4d7bfd8281af10c61b2a63fdd6a335697ef2dbe5be2062c43f93ff' 
  AND token = 'e9w/wKiFlY3hTcIP6WPnYJfTfUl2lK0Ky/p83K1thCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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