SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e6f3c9d2d751836f90d92958dea7248ea8b257d8250fcc0881b83c6c4fce3d6' 
  AND token = 'v2nk+6xQV/ijAzAnp9O84ZEKMbqcQPVvHDKRws4sCIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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