Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a9f9d33d30ce86e604d132f41d7f1f31bc32b5aba8efd230d5392ce1d9acc7' 
  AND token = 'I/wpoz8m/+sMD9ZvbitrK6QCAkuuuCRQ904HTZ1DH8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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