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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e68d85562ebebd2b6d7b3345d7f572001a40f1b7c57b801a43f4d7209bde91a' 
  AND token = '6DNPq2wzldVvVX2Svb5n9tu11OsNUspj7C4KRiACc7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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