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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c375a3617d922a8ed657db8eef4210459950407a9f1823f6c15b3c75ed9c91f' 
  AND token = '5OGoG0SNEhDdoqIOdIZsvxP3t3MXQg4alZB8Y6cNtGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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