SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a6b1173dd056a7b2ffb88694bffb845d0a31f415d6be82ccba7f604a9225b3' 
  AND token = 'VVvYBrB4/w0w7XxDox85SjZu9Oy40gaQWAkzqM6RRg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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