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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d6b9313bd0f0c29bec14262df9482ea3674c93b2681d85c3e4504c2afb8bd3' 
  AND token = 'U9eF9YWIypzlWHnQO3tEell1sIfO9YUFU+5HTe60SiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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