SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45fa037514f4ec39918817ade21ee17315cb2d27047fb83661d00f3b03cb04fb' 
  AND token = 'lRTqBW2K+YYzf5NO4q8ADqUsgQijB0DNmhe/lI4aPwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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