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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '726debf667b0ee9b85aaf45889f2698de0a87a1cbc3f1177660d117d91887076' 
  AND token = 'D6KF6PpIMnE3UjUpsp0v4f4W3KzcX/xHalUE7NYYSHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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