SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17bb7abfadee8ec7fca27ebb5cef5e1a891626c2719356ee4f54e43b957f10ce' 
  AND token = 'jaLUUclKJLs4d50qSPDWv1I16PT5iblGzs2GNW06UmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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