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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df47b2828a019e775a65a8e397e7ae6f40c3eb6ea2207f209147220d5c00c41' 
  AND token = 'waVhvoDYORcSPBK1/cycUUg/7jQG6WQoEnr9tPCSQ8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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