SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6e41a1b528b9d6c1b5f15f947cd30b33f587433488b9ca902110cce22b4489' 
  AND token = 'D01nwIuzxCoRoQV2dlzJR/zozgSu4IKfZYdsmTjBT44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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