SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '730bb0204b4332c059e22bf557f8c2f4aefcd5fb7569e2ab4af7d2a88b134899' 
  AND token = 'mYgP+qQsquzkFNDdz8koeNIjqPK7OJYcvnrlzztve+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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