SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e0469bd5e962e233e86f3453cfc90d29ac535ddd197873d298becb533518b5' 
  AND token = 'qHZ7W3j9wAZdLJvZlIwxnY4zNqOizlSQzLA+CGo6TbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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