SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '867d106ee8574604271718eb20af1c7820b4946131534fc8e63ce9b8cfd42994' 
  AND token = '47AsHKEJD+v/VgDJk5Nikul8G7Y9FUlgv79+nhQ0L0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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