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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19dc4611b621d92c61941337711a8e64b98c1996173695aaeca80107066f8d2f' 
  AND token = 'WUKcn+DRjUT1PDb6ipYC1sFuMN4sla1Y35T9CITN/js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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