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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39db589c981dc0691c32946e485b267d3d67cd5cb6f315f6a36ea88102536b74' 
  AND token = 'Cm9FRf9JHBicclKJTadLD2RZd3nPcQxZ8rRytJhSG1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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