SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc07ba3f8f83796f7da9fd1773b60dd82c5376277ddac31d19fa1c64b85cb713' 
  AND token = 'WDxKasSMUJqnzBLENbslDj0DNNZuBzbgHsofIvHFJJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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