SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '965d22358c43ca22eadf91028942b7763468741e5d56ce40c186c3ebd099965b' 
  AND token = 'BIIpQaRbEJxqQRa/n+7DO6rAmsvdlY8mwsGUfSUBKps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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