Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '115f09c1bb46df52e24d25314a99fde337a8fc832a1a535d4208b062deba758c' 
  AND token = 'jr0tGvhv6GYIyKmWnODgJiM0aa9XRXEUcwdE/pvtI4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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