SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02944d164f72f5b7da02514369bf3942a45bb5a30294edd6aec3cf86d9e5e1c2' 
  AND token = 'jQPoUVf+F/7Q+l5nUTqmBsL204jC1GUCh9xWlahTyL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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