SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '072d0eba6385c53a16244716c3b76b8ba714da7a8f9bfc93117a30cd762504eb' 
  AND token = 'jYdMJVwvxln5hGtc21IqRqRqNVmiPAO0LZskuvY9wpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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