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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a87438e9cc113f4ba8ef29ed6ecae193026e2d52109a211bb20c92feb24d10' 
  AND token = 'SgZKrAxtQVc53nP9pxdnH5DRUpLDi0BXDcykY/VCh2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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