SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '153f0209c6a45017819b75b41a142c8d8e91f12b59992d8bd91a8544a0452675' 
  AND token = 'MfSYKDeSdjKYR8XJV9cRhWjfWE7tKxfSBvYpurOgFJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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