SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca47525e3042dd0a334fd674d96bf4f1061b0048aa353289dd242eb9cf779c25' 
  AND token = 'qUelxs9p9KfYGVU4RuAl89gSGEDhb+K/wtISNiCAeFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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