Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3f008eb842ee8963a2103d6c73e3506f8e6fa27710de603b318281fa8b32ab' 
  AND token = 'y6cH/CGiOXjlGvkAHV53DzEMQwnC4jwHuR5aw6JbrCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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