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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffab400966f6b4bbf6ff6e80fa0c282822a18abc5c8b20d2586e383fe5074132' 
  AND token = '23SeA4C7wuOAALYqKiajEaDcOkLs995XhPhfHnzkuvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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