SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75364c403d5b7aec530b54329bf719bca07f48f08c6916c37c94fa40a6b04d40' 
  AND token = 'AoKwjGn0kFFJRd0hiDLrltCZhW/6FbqBjmppkcYZRA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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