SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c72431e7b4dd7747b4756dc355602ea1a6f4977304c92112a73961f816c93335' 
  AND token = 'MvgZUGWDAbs2xrWfY4BfveYjf1VZVuvH2IZbpqpz0RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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