SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9e071997d83312947ab53478b43b2f7410b902be05376f454f76388ac7c8fc' 
  AND token = 'MWZB/iyn7PI18T7KXw6KjG+YvPp0GNBtxvc7SGPANhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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