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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b854e85664d79a273715ead77c2cf0d060c0bb979bdf717eee9ea6a3c7805939' 
  AND token = 'UbRCjUTiQcOWHdWZTzvNN6kMIamZv7vPa2ykVDjRN84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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