SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5167374dde18638db11e904a2e5fc192dd3542a3c4484fcd97df3947f7169b16' 
  AND token = 'jGI4d9F+h5biSy+f9LVDLLRzFYiJjWd26DPPqNX5wSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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