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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4713afd3d5f1ca80a3245d830333dab0fa90654c7e154e6be4cf2b57a509747' 
  AND token = 'zmyFLMSxE11wN05dHnc6ajby9AsLFwOYUtZ06io/v4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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