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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b889482e88f21ec35d3f095db6a6e5c938df21c545cb2f81debbe65ed0e3958' 
  AND token = 'Zx5oPFjXYUt+iJ3bebxmyhcEUtzxao0ivGNHCxWeiYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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