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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36b978bfe9b2ce99b35c766252c275b9c9041dc7c122cd232a9e8182902253c' 
  AND token = 'JYzagC4vfs+fpzpjqYLNOVVTd2CTa3HBZx+BydsxreI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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