SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ba9a3b2f77f0867cf74ad3072bad0c772def4f019e561b63e8a9c157ed87fa' 
  AND token = 'P66dJsFJRzGZfBV9WXg1ut5XGdf5wNQwQFIj4lyg2LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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