SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad264117c7dd4c7225139725f11ac7f5a792b5fbe119f431159ec5014c4a66d4' 
  AND token = 'TjQCzyURsYW135M/wWP/vqD3LKAfx4wdfhGtY9R/bJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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