SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95125512a06d7ad9b40e9c6550f031f0a3d8e01a24880e58c5c516af9f7432e7' 
  AND token = '/gvBXqJza1awjMTTZZ+p2h6iHMXBKcXhWIj+1SZWNCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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