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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d053e5f6cea6cdd7a694a65bbc86a5dfde7939364b635e5598b6d6367f2108' 
  AND token = 'jYLsRPG1J479aSSjX4TiTUeJNYAjfJPfGBz6N3JoUz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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