Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec4ffb403835a0ba80f4ea50053c04b1813fe9b20d66e4379ace28e5f43fb4d' 
  AND token = '+pxSGxmOf/7Ajkomfqew0+SMkbYhB3oNnGq1+4CvNSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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