SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f0bf018cefb9311645f01d090251e1907e7abf559df59f01f9862200db3697' 
  AND token = 'a9uZY/VG7/hJBzXjqfljL8e5UvAehCcQY6rfSJ+MRzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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