SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '870022b31727e6fca0b8d02b4a1ec942dbf0908a52c4efe926b2fa23f990614c' 
  AND token = 'HMqjqB16x99BIW/0gyVnDYRtXXAZiYwcPmgLoSDruJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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