SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6956d1c2363b3e89fb61ec87604d644422f4856e8442d6a49efe4934733b822f' 
  AND token = 'qTQfFrL4SD0LX/1cUHJZurYpAtjwV+pashJmFJ5NAzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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