SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1467f4807945b3603881b01260e9d336c207144a9471fe1a30e4447f0adfc098' 
  AND token = 'KAtC/miOyhvTZPDoKvTo1kfDGpOIYXTmJj/5fgOH/jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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