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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a3803631ff0e168aee8bf6a043905faa7b799b6669997731b42aee17d8c023' 
  AND token = 'ISrfRdu4GjY7fleE6s3M1pHlPHnAZvPATydaxEPbRCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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