SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '086a954159cdbdccf096d50a68cb5ab119f9b82c18503b0fc232586e3700d39e' 
  AND token = 'zhq7D5YyWdS+KcvgX4KHgHykxqTgGbHVkg7oJ73w8eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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