SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8472c38abf69b050b86d1269e34e570f0822b4171340c01bf2c6d75c90e8affa' 
  AND token = 'ZZGueQdI16XXhuBhJflYOWXbnKv/5vsj2Jrv3gbXokY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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