SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199864aa94858a5d0f06608e70c61aed26d766bef830ecda832d4dc5c0ab12c2' 
  AND token = 'KFhjCJpyr5XPOlFCDYwLLjM/D5FNMixUpVqvzoTlrq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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