SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0019d1fd2959fe673bb6f001d3867bf85e05bffd972a06ea86c62a1d9399b7e7' 
  AND token = 'VlMI3yR/jvBrVgiXz//89K9WhZsPKlB8lrjSZIb4KG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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