SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05871ff6f1dd3276c353ec69aa3b4c8e8c1b79fd563c489a2173ae692f89d61f' 
  AND token = 'krNnv4wd2ggiW79toHGhuKbPLcq6kKN+YM7M/hvVr3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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