SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e4cc8e6594642c0a9d3bf93888e978ba10b7e2c8166de6a9721339319cb2f25' 
  AND token = 'JbEpWwVjnvCoVTKV7fRL5kmUrR9SHgqBl58jT5pjjME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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