SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f474225487841e2cb970cf6efd9387403b9996eccaa91544cd4187adde7c24' 
  AND token = 'm+9lrV6j+9V7Y+yvRTiLqHEXxDXgOzqsm98ZYHcssPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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