SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f8e537460cfb284701f71745592bfc4335929380c7614cb70117f64a165157' 
  AND token = 'RiK+1mKYUm3FK/2WWKX4aDZi56JzuNgZesYjvJSMlV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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