SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3385a899e7f42c4fb7e6b080a5afc48dc06d8e264e75133b1a709023fd4c441' 
  AND token = 'pNYKIaoM5dJnqIVKuLij8s/DjQizcHOITEvkCLwF8F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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