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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de91304d6e7d050462f48ec9192ce8e5acbef2223eea657a4e186653acd4730' 
  AND token = 'TwkcatqIy46Ih9z5GxmNFn43wjAjd3w+0nTIW8rwBRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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