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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77af704cd93c6d9e73792a5158d4568d1c61efd2ced8acf4e797d5e596f6433d' 
  AND token = 'NCIEa1T27i4wC5YAQtk/R6TQt8WZEmSkRNGDCKLb6Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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