SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ecee79870900ac91469f055244bc108ce3eb833ea52ec801bf4812aec2c977d' 
  AND token = 'ZMwmhAQlLaBug8jf4Vs0mhRKqbaazSE/KgHzqiYgvBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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