SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55524de7c1f8885afaaed716b723f647b1e2da29ef684a06d67ef6060acc4c71' 
  AND token = 'QCAbSDXGBH1UqwcoSgyamnRPm18UKPoKsz9pJpKYVhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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