SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee80e73c3270678b528aa3159582344134d7d2ed24e97f05f028e03736ec43d5' 
  AND token = 'MRwvVIUymZLZ79iOLMjYL5QBJctE5ZqUh1OzQLFxKbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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