SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a01b806b8d2c97faaaa2246560c81348f429ff849de5073395995e2ba85f592' 
  AND token = 'X/oRn6V9WaqLjbjRqCH8W4QzJRZgZlkAYLveuGHeO7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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