SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd774354d8dd030e42d8d6761a92bbc50fd46cc82f7ea40c0ea134bf92694920a' 
  AND token = 'sYpF1rp32rjT/gofVwKGhlnZLN4V+PUY+bYwLfjSarA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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