SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5450a4b4faf942b21e20e41465d87844c413c9853761dbb5f08c9faa44f04d4d' 
  AND token = '+57rjexYH/J9pqzn/+zFhtwvoiDYaD4NLMtWg2dFwIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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