SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f03d7a5c306b42e0c3b699a0fc91ca48b6167b9da899afb8e23765d3cb62f1' 
  AND token = 'GtjqAhPwjxZp1um5XVgO70Dx37kpL/TJyQW8TeW2y5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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