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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a04a8fc8f183091cb0eed831fe9ef2ee38c188b6ff19b03b571497deaccb5310' 
  AND token = 'YPMc8w8KlNgyeUChAYjCok1mKzZZiXJPZPwk71Zmdbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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