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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949bb75b424853dde168bd964531c41ed5c0e7b71218c97b0a561669b334aff8' 
  AND token = 'jQW0R0dJ7Lrj5zUupDyARi9OmQ83cOEbsPJEI5FW9mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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