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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4db8c58314e2855a5b02a49d2b02ad8f2ced986ba366e3e99dd0a7333c5e81f' 
  AND token = 'oN57kQ9rnH+vTKWh/IhiQRO1OJlqedZiaiEDJGTj13w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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