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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '778936cab9e4879cb30807cb1be84564589a43647e482b45eb457bca98aa63a8' 
  AND token = 'OGBuNnupqD6lDozxrJPVbAaIhdX+PEtXt4weyMbfJro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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