SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2142abb279b42fa8e9c406c843bd9b8dc1a34bb205cb08d579b0208b216192' 
  AND token = 'vfuCkh9+UAp5sqZVqFD3H/xvHgx9JaWgBK9oaGoNsI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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