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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d097611fb31f788e61ef4d88a8454773878776977c08d952e82ab02f9db9ba' 
  AND token = '6b4IoxDj/Is0s8BCdoK7YMwaWt6qHhSF1cjqS5jFoow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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