SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33d8d1b8e0a3aba5576a41b05d2c0261879fe9a6c8fde2f925516c4e24c1883' 
  AND token = '24PhKFyVxE/zRMY6iZxAZVPEuJkZBs9Nh+W9fJl+0Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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