Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '457930772fc9f82a557a2d33e3c0e9f0abb5dbf265e7929ed00546ecfe715880' 
  AND token = 'b1oZBp+K4Rw8DdWpOC8KUrkFIJBixDbZry6H2ctBPH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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