SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '853f71e8b5c93bde62bf28e79b43206816de55907956ae5782c80f1115f3712d' 
  AND token = 'dGXf+sUV7SHRQ/PgK65/5LH3gz9TaKpCHQnPfrlK+us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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