SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0836fe2922c5c85675d9a931c99fb0ab0c72053754ff17c89e2697a431bf8147' 
  AND token = '8MYXKsmpZZYnyYNNS2dwm0jHBZzKOYy9lG1qI/LUWGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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