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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bba2957fd4c0f06047024da361363cdaef4b5d2015ffa9a95458e42724fd357' 
  AND token = 'kwAA16jUQWkWky8JsqYMZy0jGsBgyxdRzPb7ffXBS8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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