SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e47c01c2f46f359c29c04425adb23d22018d79a58c5fa009bb2d29f6ceb7f87a' 
  AND token = 'qCC4/7B+Jfd4mCZozMABGqNYKKhai/xv6eErJV0sIsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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