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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '024a97cbcf5273be40e485a69587487866af91cbde2a0caa4fd27aea137f1fcc' 
  AND token = '00nYk0GLUvfI+nQNVdz2fe/+qTe3JsVVCMFzT+s1oyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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