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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fbb93f4cb20d633fc84dbff37c04e01a7968771a46eda3a8f922dafbb4d3d24' 
  AND token = 'iZy0faPnpEDnUB9fz1FhQhBsC7WxetYe+EhVi8u3b2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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