SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698a83c9145bd77b13c5514171311609fda64aaf686dda7041c2e47ad0868ef9' 
  AND token = 'FHSgzujnGIWz7m+kRFm7eeChkjwLsEBXEkX9aocDlGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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