SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32cc550aa5071924340f8fc9ca7a1b25cc9c69f541bc3d9986f70d0933b4dda7' 
  AND token = 'ELjv4lM5CroxPwCBbYSDzqvwFN0X+OlBFdel8ApRgIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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