SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf197cd9e72e430279f9a31c17eb8b0bab83feba5e7e7d6683ad5d1777a854d' 
  AND token = 'XAkYEWquOSjgkiBuO0dCOvZShHJ+/SwEGhHMQEV5n90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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