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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '468c6737c8e640bd22c2faa3c6b3a13f34abe50e6b49cf8ece15d4255ba14883' 
  AND token = 'ONP7w32brEMQWVIBLdsGa9ql5j9Y17duJe356yhUl2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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