SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d84832d40e4ebcb8f6e88c35dd6b165b29996c57362087f461343f1471d966' 
  AND token = '7PbsPlaZEblpU+H2HbJxYyuJCo9Xt7qX8WR/+UfL4VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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