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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1182be555bf87f3146386e3bd2d7fbaf400472d684751a8c7801ee2621e1f344' 
  AND token = 'OqGvBpK6RTwj6N4qCf4DG3zvUh6rRteb/O2MHVTxKkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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