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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b11582f8662cef332b327d9b89b1285106013d2d4ea5c92b0027d78d4b5202' 
  AND token = '2HHvvLJYjRrVm3dAsbg0SOkgmkVuXopl6ERos6jPe9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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