SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '774cef8f9654fadabcd56bc7cce8654c8f2ec01bd192791f947ea445a94419f3' 
  AND token = 'QsTCTdZ722LoylUNNd20hD6WLR3PlYbB0Wp3U1W9NK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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