SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4176c00e16db0928068456ab7f573d924b1964793cce55e496f4bc8b9d6574d' 
  AND token = 'LB05HOpzU8Nrpq2oc1ZrYkIqznphZfgvQgbzXlnDw4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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