SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1edc965922db4d09fdf87a02e9293fdbb10419fe29a3d3c761c74a0f157b11c9' 
  AND token = '5o3eS1mwK8YR6Gtho4B4/ZqqrmxeEOOvX3JDQbhXHD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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