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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abdc497304923965f5ba459f109e8a576a721fd903660ceb929604526edbde25' 
  AND token = 'HARwWEgnWfSeH0b//lR8/8OdTXgLJsiZmwdeZfHAo/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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