SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8928e8bf92c553c757d975831f602bcfd0354e2d30a71bb130721d1cb78dfe9f' 
  AND token = 'zB8ZcX2BzVgc7G/HqmNiSxqtK5hl3CJX9vWMns5kBho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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