SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70bd4f852fb5c698a35e9d22e9f6377e9df90006b91bb5421933c7fbdb225889' 
  AND token = 'dvKVixYQScj4ZPNwEbO8NSnXYHXh4A/+JI2KJcerj20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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