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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3def701812ce60737cd33689fe03ae10c2f5522bfd284557b48cf661a6a9ed' 
  AND token = 'nWeUIrFe+UzXiL3Q7O6BfgBuT4/rKRnnTBCt7YXj5Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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