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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ee19d5170e5edb254c3c16577d648cbdd32b5e2c7962d640cafcda551b48e0' 
  AND token = '/DAr0YRwCslxlK6SMZelLhRkrnHOGAoPH2I5V7lpybI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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