SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085d700c563883fbfe486f9e9dad8b1edc4f44ee0322b796a516f454c5d33316' 
  AND token = 'quKSbXsvHgJebcn6iNpm8BNqIqxl3DFP+QVv+BbLhrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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